NRRD

Tools for processing NRRD file in Matlab

• Input/Ouput
  • nrrdread (by The MathWorks, Inc.)
  • nrrdwrite
• Coordinates
  • ras2ijk
  • ijk2ras

I/O Usage

% read nrrd image in matlab
[data, meta] = nrrdread('your_nrrd_file.nrrd');

% process the data
processed_data = your_processing_function(data);

% edit meta data if necessary
processed_meta = your_editing_function(meta);

% write the processed data in nrrd
nrrdwrite('processed_file.nrrd', processed_data, processed_meta)

Coordinate transform

% read nrrd meta
[~, meta] = nrrdread('your_nrrd_file.nrrd');

% assuming a point ras in RAS coordinates is known, transfer it to matlab coordinates
ijk = ras2ijk(ras, meta);

% transform it back to ras
ras = ijk2ras(ijk, meta);